Further Sunyaev-Zel'dovich observations of two Planck ERCSC clusters with the Arcminute Microkelvin Imager - Hurley-Walker, Natasha; Brown, M.; Davies, M.; Feroz, F.; Franzen, Thomas; Grainge, K.; Hobson, M.; Lasenby, A.; Olamaie, M.; Pooley, G.; Rodriguez-Gonzalvez, C.; Saunders, R.; et al. (Wiley-Blackwell Publishing Ltd., 2011)